A bridge is a structure built to carry people, vehicles, or trains across an obstacle like a river, valley, or road. Bridges solve a fundamental problem: how to get from one side of something to the other without going all the way around or getting wet.

Engineers design bridges using different techniques depending on what they need to span. A simple beam bridge works like a plank across a stream. An arch bridge uses a curved structure that pushes weight outward to the sides. A suspension bridge hangs the roadway from massive cables strung between towers, allowing it to cross enormous distances. The Golden Gate Bridge in San Francisco is a famous suspension bridge spanning over a mile across the bay.

Building bridges requires understanding physics, materials, and forces. A bridge must support not just its own weight but also cars, trucks, trains, and sometimes thousands of people, all while withstanding wind, earthquakes, and temperature changes. Ancient Romans built stone arch bridges so well that some still stand after 2,000 years.

The word also means to connect two different things or groups. When you bridge the gap between two friends who've argued, you help them reconnect. A teacher might bridge yesterday's lesson to today's by showing how they relate. In card games, bridge refers to a complex partnership game played with a standard deck of cards, where teammates work together to win tricks and fulfill contracts.